Table 8 The NC values found compared with different methods.

From: An improved reversible watermarking scheme using embedding optimization and quaternion moments

Attacks

Parameters

Ref.62

Ref.63

Ref.14

Proposed method

Median filter

3 × 3

0.9637

0.9783

0.9960

0.9988

Gaussian filter

3 × 3

0.9676

0.9785

0.9957

0.9966

Gaussian noise

V = 0.001

0.9843

0.8020

0.9971

0.9632

Salt and Pepper noise

0.001

0.9975

0.9790

0.9980

0.9896

JPEG compression

QF = 40

0.9856

0.9810

0.9965

0.9996

JPEG 2000 compression

CR = 8

0.9878

0.9860

0.9970

0.9998

Resciling1

 × 0.25

0.9963

0.9912

0.9903

0.8553

Rescaling 2

 × 4

0.9934

0.9989

0.9957

0.9989

1-Sharpening

0.2

0.9763

0 0.9239

0 0.9836

0.9975

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